Dry scrubber system

Active Publication Date: 2013-11-07
GENERAL ELECTRIC TECH GMBH
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0007]The present invention provides an air quality control system (AQCS) comprising a circulating dry scrubber (CDS) dry flue gas desulfurization (DFGD) system operable using an aqueous slurry comprising a reducing agent such as lime, rather than a dry or moist powder reducing agent. The subject AQCS system uses a CDS DFGD system in combination with a fabric filter module to treat flue gas for the removal of sulfur dioxide, and like particulate and gaseous pollutants therefrom. Traditionally, flue gas CDS DFGD systems are designed and engineered to operate using a dry or moist powder reducing agent, such as lime. The use of dry or moist powder lime is desirable due to lower capital investment requirements and associated operating costs as compared to wet flue gas desulfurization (WFGD) systems or spray dryer absorber (SDA) DFGD systems that operate using an aqueous lime slurry. However, as with all plant equipment, after a period of time the equipment becomes wor

Problems solved by technology

However, as with all plant equipment, after a period of time

Method used

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Example

[0014]One embodiment, generally depicted in FIG. 1 as a process schematic diagram that includes a boiler 2, an air quality control system (AQCS) 4 and a stack 9. It is noted that many additional and varied process steps using additional equipment may be positioned or take place between boiler 2 and AQCS 4, as is known to those skilled in the art. Likewise, many additional and varied process steps using additional equipment may be positioned or take place following AQCS 4 and prior to environmental release of a “cleaned” flue gas, CG, from stack 9, as is known to those skilled in the art. Such additional process steps and / or equipment are not described in further detail herein for purposes of clarity and simplicity.

[0015]As noted previously, FIG. 1 illustrates schematically an AQCS 4 for cleaning dirty flue gases, FG, from a plant 1 conducting a combustion process, such as those from a fossil fuel-fired or coal-fired boiler 2. The hot flue gases containing SO2, SO3, HCl, HF, fly ash ...

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Abstract

An air quality control system (AQCS) useful for processing a gas stream, such as a flue gas stream emitted from a fossil fuel fired boiler, for at least partial removal of acidic and like pollutants therefrom. The air quality control system includes a CDS reactor useful using a reducing agent slurry.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61 / 643,432; filed on May 7, 2012, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention is generally directed to an air quality control system (AQCS) useful for processing a gas stream, such as a flue gas stream emitted from a fossil fuel fired boiler, a combustion process or the like. More particularly, the present invention is directed to a circulating dry scrubber (CDS) dry flue gas desulfurization (DFGD) system operable using a lime slurry supply, to process a gas stream.BACKGROUND[0003]In the processing or treatment of flue gases or gas streams, dry flue gas desulfurization (DFGD) systems are known. In DFGD processes, lime (CaO) is first converted to hydrated lime (Ca(OH)2) before contact with the flue gas. The hydrated lime contacts the flue gas as a dry or moistened powder in a circulating dry scr...

Claims

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Application Information

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IPC IPC(8): B01D53/50
CPCB01D53/508B01D2259/128
Inventor FIEDLER, MARK ALBERT
Owner GENERAL ELECTRIC TECH GMBH
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